Clover Stornetta heavy cream turning into creme fraiche

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Clover Stornetta heavy cream turning into creme fraiche

Has anyone else had the experience of Clover Stornetta heavy cream thickening into creme fraiche by itself after just sitting in the fridge for a week? Any ideas on what's different about their cream that makes it naturally turn? It is pasteurized, but not ultra-pasteurized, though I'm not sure if that's what causing it or if there are cultures in the cream already when I purchased it.